The Portal Road is usually a lot of fun until the Monster Trucks head up and tear up the snow. I've been able to ski all the way down past Lone Pine Campground to Olivas Ranch Road on one occasion. It's a fun workout (tour if you haven't done it).
As Doug cautions, you need to watch out up there. A few spots on the road have slid in the past and probably will again.
Simon, I haven't had the bike out in several months (other than one ride to Owens Peak), so the pressure is probably lower than it should be for normal road riding. I found out yesterday that I can ride the bike over ice. On the way up to Mahogany Flat (Telescope trailhead) I made it past a few sections of ice on the way up and then just left it in 1st gear and put my legs out to create a quad-pod on the way down. There was only one section where I worried about the speed I built up as I was crossing the ice.
Last edited by Richard P.; 12/21/10 02:04 AM. Reason: Simon's question...